3.8 Throttle Body Swap on 1.9?

[Scott 02]

I have heard of a few people swaping the stock 1.9 throttle body to a 3.8 throttle body. How much work is involved in doing this? What will this do to the engine performance wise? Will it run too rich?

Scott.

[Mn93LXBoy]

yes you can do it, but you will have to grind out a little at the intake manifold to make it bigger so it lines up right

[Scott 02]

How long will this job most likely take?

[450HPviper]

Scott, we will do it, but not right now. I don't have the $$$. Maybe towards the end of May.

I hope I can feel a difference in performance.

[jeffescortlx]

I tried it back when I still had a 1.9, I uesd a 50mm 1st gen GT TB.
Both the GT and 3.8 TB you will need to not only port out the first few inch of the mani but also move the throttle cable to the other side and and rewire the TPS to use the 3.5/GT sensor, (cant reuse old one because the senors are on opisite sides, they spin in differnt directions).
I probobly gained about 2 hp in the high R's but lost it on the low. Its not really worth the effort, there are better mod's to spend your time on.
But you can give it a try your self, maybe you can convince your self other wise.

[RACETRACER]

I found ,the only way to make a throttle body biger than 48mm fit ,was to cut off the upper plenum of the intake,leaving exactly 7" of runner(I cut off about 3" of runner) ,I welded a piece of allunimum driveshaft tube(about 3 1/2" diam.) to the runners, the intake resembles a 9 laying on its back . I made a plate to mount a 65mm TB from a 3.0L "99" ranger, I belive, I am also using the throttle cable from the same .
I had to fabricate a bracket from the two usable parts of the bracketts that came with both engines respectivly,for that cable to work.,and bought the TPS sensor harness repair kit from ford to patch the "99" sensor in to the "95" connector power gains are only realy noticable when I hit the nitrous VS/. with the big TB and shortened intake, it was 1.63 seconds faster in the 1/4:smoker:

[jeffescortlx]

Originally posted by RACETRACER
power gains are only realy noticable when I hit the nitrous VS/. with the big TB and shortened intake, it was 1.63 seconds faster in the 1/4:smoker:

Wow 1.63 sec faster! is that with out the blue bottle?
Do you have the 1.9?
What do you run in the quarter now with out the N2o?

[RACETRACER]

with no nitrous and with stock slightly smoothed and ported throttle body I ran 15.95 @79

I changed the TB /intake and ran ,no NOS 15.24@80

with a single nozzle wet (.030 nos - .032 fuel) jett makes about a 50 shot

several runs where made to figure out the traction issues ,times ranged from high 14s to high 13's in the 90's

and today I changed jetts to (.40 nos - .044 fuel) about a 60 HP shot, WOW,holly S
bite me.... mustangs
13.45 @94 not a whole lot of top speed but damn thats quick for a scort
I need to change my "fouth gear" ratio for better top speed

all runs where made at sealevel with stock 14" 195 65 BF TA rubber
on 92 octane pumpgas one and can of super 104 octane boost
(actualy the non nitrous runs where made on strait 92 ,no 104 booster.

later
racetracer:smoker:

[jeffescortlx]

What exsactly do you have done to your car, and its a 95 tracer 4 door 5 speed 1.9 ?
are you a member of ERDT? and if so what is your screen name there?

[RACETRACER]

well, unfotunatly ,I'm not a member anywere but here
you peged my car right on...... "95" 4door 1.9L 5 speed
I run a "95" tracer/ escort w/ N/A 1.9L cvh sefi ,I'm getting a dynoed 189 hp @5700rpm w/ 198 flbs tourque I run .. blackdiamond racing UDP ,9mm fordracing plugwires,I have shaved all accesorys(AC ,power steerring),homemade intake(the whole thing ,including injector bosses for 8 injectors) ,65 mm throttlebody,ECT mod,MAFS mod,ford racing 19#injectors, ported head,reground cam,NOS adjustable fuel press and a 50hp wetshot of nitrous,relocated my battery (for conveniance not weight transfer),a strut tower bar designed for a mazda 323,paceshitter 4-2-1 header,blowing down 2 3/4" pipe to a ractive can, fuel pump out of a new mustang(good for about 60 psi)
stock exterior apperance(just clean)stock spoiler(big ones just slow you down),ohh yeah ,the interior is stripped in the back ,carpet removed (I removed 322 lbs of crap! from the interior) and interior painted (color matched to the exterior)no radio ,no speakers,no airbags, maybee one day I'll get a roll bar ,but for now I have only a piece of chrome molly pipe welded behind each seat for the five point harness attachments
a GTX turbo /intercooler is in the near future

all in all ,I have only spent about $3000 including machine shop and new rubber,not to mention I did all of the work myself.

later
ractracer :smoker:

[jeffescortlx]

Are you still running the stock C/R?
Did you know that the Pacesetters Header is made in the wrong firing order?

[450HPviper]

RACETRACER, no turbocharger?????????

the interior is stripped in the back ,carpet removed (I removed 322 lbs of crap! from the interior)

Did you redo the floor boards? How did you remove that much weight? I'm not saying you didn't, I just want to know.

[RACETRACER]

a list of removed stuff


spare tire
jack
trunk sheetmetal support( trunk is tacked shut)
all carpet
all interior trim
seats and seatbelts
inner hood frame
headlinner
rear door glass (changed to plexi) backglass is still safety glass (plexi that size is expensive)
window regulators and inner door frames shaved(back doors are skins only)
consoles
speakers
airbags
sterio
AC and powersterring system(biggest weight savings)

I started setting this car up for rally competition,but the cost got out of hand ,so today it's just a "steet car",a very light street car

later racetracer

:smoker:

[450HPviper]

So your down to 1700Lbs!!! That's light. With about 200Hp.

[jeffescortlx]

What did you do about your PS rack? Did you swap to a pony system or just remove the ps pump and plug off the lines?